Lock-guard.



W. S. FARNSWORTH.

LOCK GUARD.

APPLICATION FILED APR. 15. 1913.

Patented Nov. 16, 1915.

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LOCK GUARD.

' APPUCATION FILED APR, 35, I913. Ll w fi f fin Patented Nov. 16, 1915;

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LOCK GUARD.

APPLICATION FILED APR.15, 1913. 1,160,978. Patented Nov. 16, 1915.

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A'rroRNEY 'iI-LIS SMITH FARNS'WORTH. OF SAN FRANCISCO. CALIFORNIA. ASSIGNOR TO COIN CONTROLLED LOCK COMPANY. OF SAN FRANCISCO. CALIFORNIA. A CORPORATION OF CALIFORNIA.

LOCK-GUARD.

Application filed April 15. 1913.

lie it known that I. \Yiiris S. YARNS- woiz'rii. a -itizen ol' the l iiited States. residing in the eity and county of San Francisco and State of (aliloi-nia. have invented new and useful improvements in Lock-Guards. of which the following" is a .-;peeilieation.

This invention relates to a lock guard and particularly pertains to an attachment tor locks of the eylinder type for preventing backward turning ol the cylinder after the leek has heen operated.

lt i; the ohjeet oi this invention to pro vide an 2\ll2h"llllltllt 't'or cylinder or tuuihler loeks oi the Yale type. l y niea1r of which turning oi the lock cylinder a l ter the lock has heeu operated will he prevented hetore the \vitlnlrawal ol' the key. and whi h attachment ih e$p iaily desie'inul for use in eiiuneetion with eoin-eontrolled lot-lei for the purpose oi" preventing the accidental retraetion of the holt.

in the form (it eoin eontrolled loek set forth in my eo-peiulin; applieation. liled June '20. 1912. Serial Xo. T LTlJJ the eylin- (ler ol a lock turnahle to throw the l(H'l( holt oulv ou the depositing ol a ertain coin: the luvol the lock hein oreinovahlitheretron] :i'tter the eoin has heen deposited and the holt thrown. the coin lullri retained on a tein 'iorary support during the time the lock is in its locked position and is released from its support on the reverse movement of the lOt'h cylinder in retracting the lock holt. it has heen 'l'ound liy experi nce that persons unaccustomed to operating coin-eontrolled iot'its of the ahove character inad vertentlv turn the lock cylinder haekward innnediately a l'ter having deposited the coin and thmwin; the lock holt: this inadvertent haekward turning of the lock cylinder re sulting in. the unlocking ot-the lo k and he release of the eoin. thus restoring the. lock to its normal inoperative position and preventing its use only on the deposit of another coin.

Specification of Letters Patent.

lied form of the invention with pa.

Patented Nov. 16, 1915.

Serial No. 761,166.

The invention priniaril} resides in an attachment to the face of the lock incoijforav in a llltt'llzini'nlll normally engageahle with the lock cylinder to prevent its tuzning and adapted to he released from the lock cylinder hy the insertion of a key. and so constructed as to permit o'l' the lock heing unlocked and locked after the key has heen inserted therein: hut whit-h will prevent the lock being again unlocked until after the key has been witlnlrawn from the keyhole and re-inserted therein.

The invention further consists of the parts and the i,:on :truction and combination of parts as hereinatter more fully described and elaiined. having reference to the accompanying drawings, in which l igure l a view in vertical section and elevation oi the invention taken on the line o o'l Fig. 2. showing the attachment in its lot-king position. Fig. :2 in a vertical section and elevation on the line i-71 of Fig. 1. Fig. 3 is a detail in elevation with parts removed. showing the device in the position a suined prior to the insertion ot the key in the lock. Fig. 1" is a similar view. showing the parts as positioned on the initial insertion ot' the key in the lot-k. Fig. 3 ie a modibroken away. showing it as positioned prior to the iueertion ol' the key in the lock. Fig. (3 is a Similar view. ln.- .ving the parts as positioned on the insertion of the ke iin the lock. l i 15 a view showing; the parts in the position assumed when'the kev is turned in the l( tl( to retract the holt. similar view. showing the parts in the locking position wheii the key is turned to lock the lock and prior to its removal. Fig. S) is a front view of a coin-controlled lock with the invention a )ilttl. Fig. 10 is a side view of same. i1. is a rear view with the loek holt ietiaeted. Fig. 12 is a rear view with the lock holt advanced.

in the drawings A represents the cylinder oi" an ordinary tumbler lock; the internal lock construction not being shown, as the operation, of the invention is not dependent upon any portion of the lock structure other. than the cylinder .r. The escutcheon plate on the face of the lock is indicated at B and the key for operating the lock is representedat The ci'linder A. is formed with the usual keyhole tor the reception of the shank of the key C, which key is adapted to is it,

operate a series of tumblers in the cylinder A, not shown, in the usual manner to permit the turning of the cylinder A in the lock casing and the operation of the lock 5 bolt consequent thereto, as is well known.

In the form of the invention shown in Figs. 1 to 4, inclusive, a vertically reciprocal locking plate 3 is mounted on the outer face of the escutcheon plate B and is formed 1 With a central opening 4 through which the outer end of the cylinder A extends; theplate 3 being guided in its reciprocal movement by means of the sides of the opening 4 slidably contacting the sides of the cylinder 5 A, operating inconjunction with a. pin 5 on the upper end of the plate 3, extending into'a vertical slot or channel 6 formed on the escutcheon plate B. The plate 3 is designed to be normally retained in its upper- 0 most position, for which purpose a spring 7 is provided. The spring 7 is here shown as consisting 'of a plate spring having its ends slidably secured to the plate 3, and its central portion bearing against the top of the 5 cylinder A under tension, in such manner as to normally retain the plate 3 in its uppermost position. The lower end of the openlng 4 is arched and is adapted to-eXtend into a groove or channel 8, formed on'the under- 3 side of the cylinder A; the groove or chan nel 8 communicating with the keyhole 2. Formed in the arched portion of the plate 3 isa notch 9 which is disposed to register wlth the open underside ofthefkeyhole 2 in 5 the channel ,8; the vertical walls of the notch 9 being adapted to engage the sides of the shank of the key C when the latter is inserted in the lock, as particularly shown in Fig. 4. Slidably mounted in the lower end of the cylinder A is a block 10, here shown as supported on a pin 11, carried on downwardly projecting portions 3 and 3" on the plate 3. A helical spring 12, wound on thepin 11, bears between the projection 3 and the end of the block 10 in such manner as to normally retain the block 10 with its outer end abutting against the projection 3", as shown in Fig. Formed on the block 10 is an outwardly projecting lug 13, formed with an inclined outer end; the lug 13 bemg so positioned on the block 10 as to be disposed immediately below the keyhole 2 when the block 10 is in its normal position, as shown in Fig. 3, and with the inclined end of the lug 13 disposed in the path of a downwardly projecting shoulder 14, formedon the shank of the key C.

In the operation of this form of the invention let it be assumed that the parts are in the position shown in Fig. 3; the plate 3 being in its uppermost position and the block 10 in its advanced position, and the key C removed from the keyhole 2. The parts being in this position, the key'C on es'being inserted i the keyhole 2 the shoul- 'n1ost position against a stop pin 3 on the der 14 thereon is caused to engage the beveled outer end of the projection 13 on theplate 3 immediately before the key C reaches its innermost position in the lock; the key in moving to its innermost position in the lock acting to move the plate 3 downward by reason of the shoulder 14 riding over the inclined outer end of the lug l3 intotheposition shown in Fig. 4. In this position the notch 9 on the plate 3 is moved out of the channel 8 on the cylinder A, and out of engagement with the underside of the shank of the key C, so that the latter may be freely turned in the direction of the arrow in Fig.

4, to operate the lock. The key C on being 30 turned into the position indicated in dotted lines in Fig. 4, is moved from above the lug 13,. thereby allowing the plate 3 to berestored to its normal uppermost position by the action ofthe spring 7. On turning the key C in the reversed direction to operate-the lock, the shoulder 14 engages the side of the lug 13 and moves the block 10 in opposition to the spring 12 into the posi tion shown in Figs. 1 and 2. The key in moving to its vertical position engages the arched portion of the plate 3 and moves the latter downwardly a short distance until the key comes in alinement with the notch 9, whereupon the spring 7 will operate to move the plate 3 upwardly, sothat the sides of the notch 5) will extend on each side of the shank ofthe key U, as .shown in Fig. 1. \Vhen the parts are in this position, the key C is locked against rotation in ,either 'direcvtion, thus preventing the. operation of the lock at this time. The key (J, however, is now free to be withdrawn from the keyhole, whereupon the block 10 will be returned to its normal position, as shown in Fig. 3, by means of the spring 12, so that on the reinsertion of the key (J the plate 3 will be moved to its lowermost position and permit the re-operation of the lock, as before described. I

In the form of the invention shown in Figs. 567 and. 8 the locking plate is shown as 'pivotally mounted at 5', to have an oscillating movement in relation to'the lock cylinder A. The block 10 in this in.- stance is in the form of a piston and is supported in a cylinder-11 in which the spring 12 is mounted; the spring 12 hearing against the block 10 to retain the latter in its outerplate 3. The operation of this form of the invention is substantially the same as described in reference to Figs. 1 to 4, inclusive; the projection 14 on the key C operating on the lug 13, carried by the block. 10, to rock i the plate '3 on its pivot 5' when the key 0 is first inserted in the lock, as shown in Fig. 6, to move the notch 9 out of engagementwith the shank of the key C. The key C is then free to urn in tlie direction of the arrow in Fig. 6, into the position shown in Fig. 7; the spring 7 acting to move the plate 3 to its normal position when the key L has been turned into the position shown in Fig. 7. The lug 13 will then be positioned in the path of travel of the projection ll on the key when the latter is turned in the direction of the arrow in Fig. 7. so as to be engaged by the latter and moved in opposition to the spring 12 into position shown in Fig. 8; the key C in moving from the position shown in Fig. '7 into the position shown in Fig. 8.0scillating the plate 3 a short distance in opposition to the spring 7, to allow the shank of the key C to move into alinement with the notch 9; whereupon the latter will engage the shank of the key, as shown in Fig. 5. and prevent its being turned in either direction.

From the foregoing it will be seen that when the key C is engaged by the notch 9 on the plate 3, the cylinder A can not be retated to operate the lock, thus preventing the actuating of any mechanism which depends for its operation upon the rotation of the lock cylinder A.

The plate 8 and its connected parts are incased in the face of the escutcheon plate A in any suitable manner; a face plate 15 attached to the escutcheon plate B being here shown as provided for that purpose.

As before stated. this invention is pa rticularly applicable for use in combination with a coin-controlled lock. Such a lock is illustrated in Figs. 91011 and 12.. This lock consists of a bolt D, adapted to be operated by a bit E on the lock cylinder A; the bolt 1) being reciprocated by the rotation of the cylinder A by the key (l in the usual. wellknown manner. The one essential feature in a coin-controlled lock of this character is that the key is IHHCHIOVHlOlQ from the look when positioned at an' angle in relation to the keyhole; the coin-controlled mechanism consisting of a means for normally retain ing the key in its angular position in the lock when the bolt is in its retracted position, which means can be released to permit the operation of the lock only on the depositing of a certain coin. This mechanism is constructed as follows: Mounted on the back of the eseut-cheon plate B, on opposite sides of the cylinder A. are downwardly depending arms 16 and 17. the upper ends of which are pivotally connected to the face plate 15 by means of s rows 18 which pass through curved slots 19 in the plate B. the slots 19 act in conjunction with the screws 18 to limit therocking movement of the face plate 15 and the lock cylinder A in either direction.

The arms 16 and 17 extend downwardly ad- M jacent to the rear side of the :pscutcheon plate 13; the arm 17 being guided at its lower end between outwardly extending pins 20 and 20. Formed on the lower end of the arm 1'? is a plate 21, the vertical edges of which are in slidable contact with the pins 20 and. 20, which thus securely hold the lower end of the arm 17 against sidcwise movement. but permit of its being oscillated by the rotation of the plate 15. The inner edge of the lower end of the arm 16 contacts the pin 20 and is held thereagainst by means of a plate spring 22, mounted on a bracket 3, carried by the escutcheon plate B. which spring bears against a pin Zl mounted on the arm 16. The pin 20 thus serves to limit the inward movement of the arm 16 and also limits its downward movement when actuated by the plate 1.3, by reason of its ongagement with a'shoulder formed on the arm 16. It will be observed that the arm 10 may be rocked outwardly away from the pm 20. in opposition to the plate spring 22. Carried on the lower end of the arm ll) is an inwardly extending plate 26. which projects over the lower end of the arm 17 and forms a coin-slot between the lower ends of the arms lo and 17 in which a coin may be inserted through a slot 27 formed in the cutcheon plate B. A coin deposited in the slot 27 is designed to come to rest on a shoulder or abutment 28 formed on the inner edge of the arm 17, where it is supported by reason of its opposite edge bearingagainst the inner edge of the arm 1.43; the coin indicated at. l resting on the shoulder its below an inwardly extending coin-pusher 29 carried by the arm in.

ll'hen the'key C is in the lock and the bolt 1) is in its retracted position, the lower ends of the arms 10 and 17 will be positioned as shown in Fig. 11: in which position the downward movement of the arm 16 is prevented by means of the pin 20 and shoulder 25, so as to prevent the plate 13 and the lock cylinder A being rocked by the key sufficiently far to allow the latter to be dis posed in its vertical position in relation to the keyhole 2. By this construction the key is prevented from being withdrawn from the lock and also locked against movement thereby preventing the operation of the bolt l}.

lVhen it is desired to throw the bolt 1) and withdraw the key C, a coin of a certain diameter or denomination is deposited in the slot if? where it comes to rest upon the abutment 26 between the lower ends of the arms 16 and 17. as before described and as shown in Fig. 11; the'shoulder 25 being positioned a short distance above the pin '30 to permit of a limited downward movement of the arm 16 and conseouent slight rotation of the plate 15. This movement of the plate 17 is etl'ected by turning the key after the coin F is deposited in such manner as to move the arm 16 in a downward direction and the arm 17 in an upward direction. The upward movementuof the arm 17 carries the coin F therewith so as to bring its upper edge into contact with the lower edge of the coin-pusher 29 on the arm 16. The downward movement of the arm- 16 causes the member 29 to engage the coin F and move it downwardly in opposition to the arm 17, causing it to press against the shoulder 28 and force the arm 16 away from the arm 17, so as to cause the shoulder 25 to clear the pin 20. This will permit of a continued rotary movement of the key C and the plate 15, so as to throw the bolt D into the locked position and dispose the 'key C inthe vertical position, which will allow of its being withdrawn from the lock.

' In thus advancing the bolt D, the arm 17 suitable receptacle.

moves up and the arm 16 down. The coin on passing over the abutment 28 falls upon a stop-shoulder 30 on the inner edge of the lower-end of the arm 17,- where it comes to rest with its opposite edge against the inner edge of the arm 16, as shown in Fig. 12. The coin F in passing over the abutment 28 releases the lower end of the arm 16 so that it moves inwardly by the action of the ,spring 22, to throw the pin 20 into engagement with a Vshaped notch 31, formed on the inner edge of the arm 4. The coin F in moving downward passes below the pin 20. \Vhen the bolt D is inthe advanced posi tion, as shown in Fig. 12, the coin F will be supported on the stop-shoulder 30 and against the inner edge of the arm 16. The key will be prevented from being turned backward and consequently retracting the bolt 1) by reason of the engagement of the v shank of the key with the notch 8 on the locking-plate 9, as before described. This is necessary in order to prevent the accidental retraction of the bolt D and necessitating the removal of the key from the lock and its re-insertion therein in order to retract the'bolt. ()n the re-insertion of the key in the lock and turning of the lock cylinder A to retract the bolt l), the arm 17 will be moved in a downward direction and the arm 16 in an upward direction, the projeetion 28 on the arm 17 forcing the coin l downward below the pin 20, whereupon it becomes released and is deposited in any The arm 16 in moving upward is .moved outward by reason of the inclined face of the notch 31- riding over the pin 20 so as to permit the coin F passing between the lowerend 'ot the arm 16 and the shoulder 30 on the arm 17. The moment the coin F is released from between the shoulder 30 and the arm 16, the latter is moved back to its normal position by means of the plate spring thereby repositioning the pin 20 below the shoulder 25 on the arm 16 in such position as to prevent the operation of the lock until another 00111 has been deposited.

Having thus desrra bed my invention, what latter is inserted in the cylinder, means on the plate operable by the key todisengage the plate-from the key to permit the operation of the key in the cylinder, and means by which the key will be engaged by the notch when positioned for withdrawal from the lock to prevent the cylinder and key being rotated in either direction.

cylinder adapted to receive a key and the key therefor, of means for engaging the key to prevent its rotation onits insertion in the cylinder, means for disconnecting the key from the engaging means operable by the key to permit the cylinder and key being rotated, and means by which the key will be reengaged when the cylinder and key are restored to their normal position to prevent turning of the .key and cylinder.

3. The combination with akey and revoluble lock cylinder operable thereby, of means independent of the cylinder for engaging the shank of the key' to prevent its rotation when the latter is inserted in, the cylinder, means actuated by the key for releasing the key and cylinder from the for normally holding the plate in its engaging position, means on the plate operable by the key on its insertion, in the keyhole for moving the plate in opposition to the spring to release the key and permit its being turned to operate the lock, comprising a lugcarried by the notched plate arranged in alinement with the keyhole and in the path of travel of a PI'OJGCtlOII on the key when the' latter is being inserted in the lock, and means by which the lug may be moved out of alinement with. the keyhole operated by the key when the latter is restored to its removable position after operating the lock,

to allow the notched plate to reiingage the .kev and prevent its turning.

13. The combination with a key and revoluble lock cylinder operable thereby, of

means independent .of the cylinder for engaging the shank of the key to prevent its rotation when the latter is inserted in the cylin'der, means actuated by a projeetionjon the handle of the key for releasing the key In testimony whereof I have hereunto set and cylinder from the engaging means to my hand in the presence of tWo subscribing 1 permit the key and cylinder being turned, Witnesses. and means operated by the key for causing its rengagement on turning the key and the WH'HS SMITH FARNSWORTH' cylinder to their normal position by which Witnesses: the key and cylinder will be locked against F. B. COCHRAN,

rotation. MARGARET MOORE. 

